best rv batteries for cold weather – AGM vs lithium tested (2026)
the battery failure that almost ended my winter december 2022, 5°F, southern utah. i woke up at 3am to a silent rv. furnace off. lights off. everything dead. my two 100Ah AGM batteries had drained to 10.8V overnight, and at 5°F the solar controller refused to charge them at sunrise. i sat in a 38°F … Read more